Levy, Paul Sur quelques classes de permutations. (French) Zbl 0034.29505 Compos. Math. 8, 1-48 (1950). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 Documents Keywords:Combinatorics PDFBibTeX XMLCite \textit{P. Levy}, Compos. Math. 8, 1--48 (1950; Zbl 0034.29505) Full Text: Numdam EuDML Online Encyclopedia of Integer Sequences: Least number m > 0 such that 2^m == +-1 (mod 2n + 1). Fractalization of (1 + floor(n/2)).